Brown vat dyestuff and process of making same.



UNITED STATES PATENT OFFICE.

RUDOLF MAAG, F SINDLINGEN, NEAR HOOHST-ON-T'HE-MAIN, GERMANY, ASSIGNOR TO FARBWERKE VORM. MEISTER LUCIUS & BRfiNING, 0F HOCHST-ON-THE-MAIN, GERMANY, A CORPORATION OF GERMANY.

BROWN VAT DYESTUFF AND PROCESS OF MAKING SAME.

1W0 Drawing.

Specification of Letterslatent. Application filed June 28, 1911. Serial 1%. 635,741.

Patented Feb. 27, 1912.

i To all whom it may concern:

by alcohol and boiling water.

Be it known that I, RUDoLF MAAG, Ph. D., chemist, a citizen of'the Republic of Switzerland, residing at Sindlingen, near Hochston-the-Main, Germany, have invented certain new and'useful Improvements in Brown Vat Dyestufls and Processes of Making Same, of which the following is a specification.

I have found that new products, of great value as vat dyestuffs, can be obtained by the action of the naphthylamins upon the polyhalogenated, that isto say the twice or more halogenated, benzoquinones. They are benzoquinonedinaphthalids of the formula:

containing, halogen in the quinone nucleus.

The new products form brown powders, insoluble in water, alcohol and benzene, and dissolving in concentrated sulfuric acid with a blue color. When treated with alkaline hydrosulfite they yield yellow vats which give on wool and cotton fast brown tints.

Example: 14.5 parts by weight of l-naphthylamin and 12.3 parts of chloran-il are boiled for 4 hours with 8 parts of sodium acetate and 150 parts of alcohol. The dyestufl" thus produced is filtered and extracted It forms a brown crystalline powder which is insoluble in water and alcohol, but dissolves in concentrated sulfuric acid with a blue color thylamin-{B-naphthylamin may be combined with 2.6-dichlorobenzoquinone, and the monochlorobenzoquinone-di-B-naphthalid of the formula may be produced. The dyestufl's thus obtained possess the above specified properties. Having now particularly described" my invention, What I claim is:

1. As new products, the benzoquinonedinaphthalids which contain halogen in the benzene nucleus, being brown powders, insoluble in'water, alcohol and benzene, dissolving in concentrated sulfuric acid with a blue color, and yielding when'treated with alkaline hydrosulfite yellow vats which give on wool and cotton fast brown tints.

2. As a new product, the monochlorobenzoquinone-di-B-naphthalid of the formula:

RUDOLF MAAG.

Witnesses JEAN GRUND, CARL GRUND.

with poly-halogenated ben- 

